I filled mine in, but i think you can leave them blank. and if you do put it in the settings tab, it will add it to the advanced tab so you will see it in both places. In mine, it is coded in all three places, the settings, advanced, and the url. I can't imagine that you have to start over, seems you could just update the url string and make sure you don't leave out that &. make certain that your gateway ip address is the ip address of vera. another good reason to make vera's ip address static.
what is the symptom of it not working? do you get a message like userid and password is invalid? or cannot connect?